Electrically-heated implement handle



Nov. 20, 1928. 1,692,626

I c. M. CHAPMAN ELECTRICALLY HEATED IMPLEMENT HANDLE Filed March 5 1, 1926 Patented Nov. 20, 1928. l

. n. PATENT OFFICE.; i

yc:naar.non yntfdiminuait, or TERRYVILL'E, CONECTiCUT, nssIGNoa To THE CHAP- MAN MAQHINE oomrANmorfrEaRYvuLE, ooNinazcfirou'r,` A' looRroR-AcrfroN Lor v CONNECTICUT.

,ELEcTR'IoAnLY-HEATEVD IMPLEMENT rullante..Y

' s. yInitiation mediterranei, 1926. f serial No. 98,674.

f This invention relates toy details of the construction offelectrically heated'soldering implements. lk The fobject of theinvent-ion is torso dev sign, construct and `correlate the parts that while the copper point may lie-.raised to the required highltemperature the ytotal length of the implement may be made much shorter than is Vpossible ywith the common types of l0 solderingimplements and thus it may;y be

more easily and exactly yhandled and manipulated in use, the parts offthefimplements being '-rugged, thoroughly. protected, easily assembled and 'readilyvrenewable .in case of necessity,-and ther-handle and shank secured together inesuchmannerlthat there can be no turning of. one in relation to the other.

' '*Th-is objectisattainedgby winding ,the

" `properly insulated heating coil upon acore consistingl of a` substantial .mass of metal. of ygood heat conductivity and "attaching the copper pointdirectly to the outer end ofthis core, that is, .the end of theY coreftha'tl is furthfest from the handle, and-thus yimmediately conducting the heat fromfthe heatin element in a directionaway fromthe hand ewhich` "heating element, comprising the `core and resistance-coil, is enclosedwithin 7a sleeve havingy a tubular'sha-nkv that extends into a metallic bushing whichy is insertedinto and heatinsulated froma metallic. ferrule that is concealed vin vthevhandleof' heat rnon-conducting" materiaL- The bindingy screws. :for

' the leads that pass through the tubular shank to the resistance coil/andthe bindingscrews ffor the vterminals o the circuitwires that enterfthrough the handle-are mounted vupon a iiexible support that is attached to the inner end of the tubulanshank.- AS the heat is 40 tcondueteddirectlyto the'pointaway from pin.- f

-, yEnclosing theheating unit and fitting the fthe handle and asthe'l tubular shank is `infsulatedfrom the `handle and cannot 'turn in relationy thereto the shank can be shorter and the handle-much nearer to kthepoint than'isl usual, thus" providin'ga "tool that is ,more easily khandled than the muchy longer toolsy in' common use, f' 1 l `'.[n thefaccompanying dranvings` Fig. l 1s a'sidevview of a soldering implement that embodies they invention. Fig. 2 kshows on largerffscale a side View of the copper point and the metallic core to whichr the point is attached, the heating coil on kthe core and the enclosing sleeve being in section. Fig?) visr a similar view showing yin section a core of ldifferent shape, such for instance vlas may be usedfwith a point of larger size than the one illustrated lin 'Fig'.. ,'Figf. L.1 -isy allongitudinal section of the handleshowing the handle end of the tubular shankand the cir-` cuitk lterminal strip in side view. Fig. 5 is asimilar view looking at the edge ofi the terminal strip and .with the tubular shank in section. Fig. 6 is a transverse section on the plane indicated bythe dotted line 6-6 Ion-`l`ig.4.- p v -In the'formsillustrated in the drawing the .copper poi-nt 1 hasa stemf2 that is screwed into thelange'd head ofthe core 3 oft-he heating element, thus they points `while removable if and interchangeable, have a close and extended contact with the core. The core -is4 ai substantial piece of metal of goodheat conductivityand it may` becylindrical as vshowniin.'Fig.-2 or conical as illustrated'in Fig. 3. .The Vouter end yofthe core against ,fwhich the point sets, has a head-4; and at Athe inner endthe core has a flangefwrtliat` has a diametrical slot 6 with rounded corners.- Extending inward fromthe'inner end loifgthecore isay pin 7 Vwhich maybe, to an extent, flexible.` The lheating coil of resistance wire8 havingy the required turns and suitably insulated is wound. upon the ,core

betweenfthe: head, andthe flange, 'and `its terminalsarepassed through the. slot in the core flange and led' along a-ndvbound to the head and also thek flange of the core is ka sleeve 9 thathas a tubular shank l0. The

sleeve may; hepinned to the vhead to prevent the core from kturning when 4the point is screwed in. `The sleeve may ,be cylindrical as shown in Fig; 2 or conical as illustrated in The handle l1 of Wood or other suitable heat insulating material has a central bore 12. Driven into an annular mortise inthe point end of the handle, preferably so as to be completely concealed in the handle, is a metallic ferrule 13, and driven into the boi'e within the ferrule is a metallic bushing 14. The exterior surface ofthe bush iiig is roughened so as to prevent it from turning when once driven in, see Fig. 6. The feirule prevents the handle from splitting,

and the bushing being heat insulated from the ferrule by a section of the handle the flow of heat. from thc bushing to the ferrule and outer surface of the handle is prevented. The outer end of the bushing has a socket 15. Near its inner end the tubular shank has a collar 16, which when the end of the shank is inserted into the bushing, enters the socket. A screw 1T may be passed through the socket. wall into the collar to lioldtlie shank from turning and removal.y

Attached to the iniiei' end of' theshank is a flexible metallic strip 18 to the faces of which strips of insulation 19 are fastened. On one side ofthis compositeterminal strip are binding screws 20 connected by a conduct.- ing plate 21, and on the other side ai'ebinding screws Q2 connected by a conducting plate 23. This terminal strip is secured to studs 2st that are fastened to the inside ot' the tubular shank by binding screws 25. Fig. 5. terminals of the heating coil leads may be led through the shank and fastened to the nearest screws on each terminal block, while the other screws are designed to be used for fastening the terminals ol the circuit wires.

The parts of this tool are cheaply formed and readily assembled., Therpoints may be removed and otheis vsubstituted in case one of a differentsize is desired or when one becomes incapacitated through long use. The heating coil is thoroughly protectedandyet can be readily removed and another substituted in case it becomes ineffective for any cause.` The terminals of the heating coil and t-he circuit wires can be easily connected or disconnected as desired for, by removing the screw 17 the handle with the bushing f14 and its'socket 15 is free to be withdrawn from the shank 10 and its collar 16 so as to expose the binding screws on the strip which is'attached'to the shank. As the core consists of a. substantial body of metal and as the point is directly applied to the outer end ot' this core and has large surface contact therewith, the heat developed by the heating coil is conducted by this mass of core directly to the point where itV is desired, and this low of heat is away from thehandle, thus permitting the handle to be brought closer to the point than is usual. Furthermore the handle as attached will not turn on the shank and it is 'protected from splitting, andV also from being burned, by the concealed f'errule which is insulated from the other metal parts. Therefore the handle not outside, and is in direct contact with some of the metal is in use. y

The invention claimed is 1. A handle forv an electrically heated implement, said handle comprising a body of lieatfnon-conducting material and having a central bore with a metallic bushing held against rotation in`one"end of said boreand adapted to detachably receive the end ofthe implement shank7 said handle body also having an embedded and unex'posed metallic ferrule surrounding but separated from said bushing whereby the metallic strengthening ferrule is heat insulated from thebiisliing and from'the outersurface ofthe handle. n i- 2. A handle tor an electrically heated imparts that are heated when the tool pleinent, 'said handle comprising a body of heat non-conducting materia-l and Ahaving f a cent-ral bore, with a metallic 'bushing held against rotation in one endofsaid'boi'e, said bushing having a socketat the outer end of the bushing, adapted to detachably receive the end'of the implement shank and a collar attachedthereto, said handle body alsohaving an embedded and unexposed metallic ferrule surrounding but separated from said bushing whereby the metallic strengthening ferrule is heat insulated from the bushing and socket also from the outer surface ofthe handle.

3. A handle for an electricallyhea'ted impleinent, said handle comprising a body of heat non-conducting material and having a lcentral bore with a. metallic bushing held against rotation in one 'end of said bore, said bushing having a socket 'at the outer end of the bushing,V a-tubular implement shank with a collar thereon,A detachably fitted into said bushing and socket, means detachably fastening said collar in said socket, andan unexposed metallic ferrule surrounding but separated from said bushing, embedded in theend 'of the handle body whereby the metallic strengtheningr ferrule is heat insulated from the bushing, the socket, the shank, and the outer surface of the handle; i

4. A handle for an electrically heated implement, said handle *comprising a body of heat non-conducting material and having a cent-ral bore with ya metallic bushing held against rotation inA one end of said bore, said bushing having aI socket atthe outer end of J the bushing, a tubular implement shank with ISU v of the handle body. f

5; A handle for an electricallyheated implement, said handle comprising a body of 'heat non-conducting material and having a central bore, with a metallic bushing held against rotation in one endof said bore, said bushinghaving a socket at the outer end of the bushing, adapted'to receive the end of the irnv plement shank and a collar attached thereto,

a flexible metallic terminal strip attached to the endof the Shank Within said bore, insulating pieces facing said strip With binding screws on opposite sides of said facing strips.

` CLARENCE" M. CHAPMAN.y 

